@article{c4a5b32e4f794517b9060a74e00cb67d,
title = "On Index 2 Subgroups of Hyperbolic Symmetry Groups",
author = "\{De Las Pe{\~n}as\}, \{Ma. Louise Antonette N\} and Felix, \{Rene P\} and Miro, \{Eden Delight\} and \{De las Penas\}, \{Ma. Louise Antonette\}",
note = "De Las, M. L. A. N., Felix, R. P., \& Provido, E. D. B. (2007). On index 2 subgroups of hyperbolic symmetry groups. Zeitschrift f{\"u}r Kristallographie, 222(9), 443-448.",
year = "2007",
month = jan,
day = "1",
language = "American English",
journal = "Mathematics Faculty Publications",
}